Hollow auger



W. ENGLAND. I

HOLLOW AUGER.

(No Model.)

No. 317,524. Patented May 12, 1885.

Ill

like.

5 E 5 5 E l UNITED STATES PATENT OFFICE.

GEORGE V. ENGLAND, OF MERRIMAC, MASSACHUSETTS.

HOLLOW AUGER.

SPECIFICATION forming part of Letters Patent No. 317,524, dated May 12, 1885.

Application filed March 17, 1884.

To all whom it may concern.-

Be it known that I, GEORGE W. ENGLAND, a citizen of the United States, residing at Merrimac, in the county of Essex and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Hollow Angers, of which the following is a specification.

My invention relates to hollow angers, more particularly to those intended to form tenons on the outer ends of spokes to enter mortises in the fellies of wheels.

In the accompanying drawings, Figure l is an isometrical view of my improved hollow or spoke auger; Figs. 2 and 3, central vertical sections of the same, the beveled shoulder of the cutter in Fig. 2 being conical and in Fig. 3 being spherical.

Spoke-angers shaped outwardly like the one represented in Fig. 1, having ashank adapted to be held by a chuck or collet and a set-screw,

and having cutters and a central opening, are commonly made each of a solid piece of steel, and then tempered; but, owing to the great variation of thickness in the parts, the cutters are frequently warped or cracked in hardening, causing a loss of the steel of which they are made, and a loss of the labor expended in making them. If one of the cutters be broken, the tool is also worthless. 'A set of four or five is generally used by a carriage-maker or wheel- Wright.

To remedy the difficulty above spoken of, I make the anger in two parts-to wit, a stock, A, which may be of cast-iron, in the form of a hollow cylinder, the internal diameter of which is larger than the diameter of any tenon (No model.)

] to be formed by the auger, and a bit, 13, of

steel, of the form shown, and provided with two cutters, Z, like those commonly made, the bit being provided with a screw-threaded shank, l, which engages with an internal screw-thread, (Z, cut in the stock.

is outwardly turned true to fit the chuck or collet of the tenoning-machine in the usual manner.

The stock is provided with a beveled seat, a, and the bit B is provided with a shoulder, b", beveled to fit said seat when the bit is screwed into the stock, the object of the seat and shoulder being to center the cutting part of the auger properly. The bevel may be conical, as shown in Fig. 2, or spherical, as shown in Fig. 3. It will'be seen that the stock can thus be made of a cheaper material, more easily finished, and not injured by any accident that may happen during the tempering of the cutters.

\Vhen the stock is constructed as above described, it may be used with any one of a set of bits of different capacities, provided their shanks are fitted to the stock.

I claim as my invention A hollow auger consisting of a stock provided with an internal screw-thread and a beveled seat, and the bit having cutters and a shank threaded to engage with the screwthread of said stock, and having a beveled shoulder to fit said seat, as and for the purpose specified.

GEORGE \V. ENGLAND.

\Vitnesses:

R. R. SORENSON,

C. A. HEATH.

The stock 

